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Coibri is the most pure in terms of n-butane %. Vector after that, and Power is low grade Vector. Never use Ronsin or other cheap gases as they are not scent-free (aka added toxins).

You can always do a mirror test, meaning spray a few seconds of gas on a mirror. Every canned gas mixture (intended use as lighter refill) leaves a residue on the mirror, mostly made of paraffin waxes that are added to the gas mixtures to keep the torches lubricated internally. The only pure gas (no paraffin wax added and acutally 100% butane) is n-butane from AirGas, but you have to make sure to get the unscented kind. Many gas mixtures have scent added for safety, called mercaptans, they smell like sulfur usually.

... there is not a lab in the world that uses liquid butane and plastic. Stainless steel tubes cost $7.

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Labs use stainless because they can get it. If you know where I can get stainless in NPT thread sizes for prices in the $7.- range ... I'm paying total attention.
Plastics aren't ideal, but butane is such a nonaggressive solvent that many plastics (especially nylon and polycarbonate) are OK choices imo. Bad plastic choices would include the polyolefins (permeable) and anything plasticized, like flexible vinyl. cn

Coibri is the most pure in terms of n-butane %. Vector after that, and Power is low grade Vector. Never use Ronsin or other cheap gases as they are not scent-free (aka added toxins).

You can always do a mirror test, meaning spray a few seconds of gas on a mirror. Every canned gas mixture (intended use as lighter refill) leaves a residue on the mirror, mostly made of paraffin waxes that are added to the gas mixtures to keep the torches lubricated internally. The only pure gas (no paraffin wax added and acutally 100% butane) is n-butane from AirGas, but you have to make sure to get the unscented kind. Many gas mixtures have scent added for safety, called mercaptans, they smell like sulfur usually.

Why would you say that? From what I can tell Colibri is a higher % of n-butane, and only has one other gas in the mix, propane. While Vector has three gases and a lower % of n-butane. The cost also indicates quality.

Triple filters, 5X, that is all marketing garbage and means nothing. The type of filter is what matters, not how many times you run thru it. Compare an RO filter to a triple carbon and you start to see what I mean about not all filters being equal.